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The Islanded Control block is responsible for regulating the flow of the active and reactive power, when the microgrid is disconnected from an external AC-grid, known as Islanded mode, by allowing the user to adjust the active and reactive power settings.
Mask and Parameters
The Islanded Controller block contains the following configuration mask:
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Name | Unit | Description |
|---|---|---|
Frequency | Hz | Expected grid frequency even during islanded mode. |
PCC dq-voltage threshold for Grid Connected transition | V | Maximum voltage threshold to close main grid break and leave islanded mode. |
PCC dq-current threshold for Isalnded transition | A | Minimum current threshold to open main grid break and enter islanded mode. |
Duration of below-threshold V/A for PCC switching | s | This is the duration where the condition must be met to enter or leave the islanded mode. To enter islanded mode, minimum current condition must be achieved for at least this duration. To leave islanded mode maximum voltage condition must be achieved for at least this duration. |
Microgrid phase error frequency compensation | Hz/Rad |
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When the islanded microgrid and the grid are out of phase, this will modify the diesel generator frequency so both network can be synchronize before leaving the islanded mode. | ||
Data Sampling time | s | Sampling rate at which the different condition are checked. |
Sampling Time | s | Time step for the simulation. |
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Inputs, Outputs and Signals Available for Monitoring
Inputs
Name | Unit | Description |
|---|---|---|
Grid P import | pu | Active power P commanded by dispatch. |
Grid P ref | pu | Active power P commanded by user. |
Grid P meas | pu | Active power P measured through the Point of Common Coupling (PCC). |
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Q import Grid | pu | Reactive power Q commanded by dispatch. | ||||||
Grid Q ref | pu | Reactive power Q commanded by user. | ||||||
Grid Q meas | pu | Reactive power Q measured through the Point of Common Coupling (PCC). | ||||||
Infeed grid wt | rad
| wt of Infeed grid. | ||||||
Infeed grid current meas | A | Current measurement of Infeed grid. | ||||||
Infeed grid voltage meas | V | Voltage measurement of Infeed grid. | ||||||
Microgrid voltage meas | V | Voltage measurement of microgrid. | ||||||
Islanded enable | - | User island command (should be set to 1 when the microgrid needs to be set in islanded mode). | ||||||
Microgrid angle error | - |
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Difference between microgrid and external grid angles. |
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Outputs
Name | Unit | Description |
|---|---|---|
Grid P error | pu | Error between commanded and measured active power P. |
Grid Q error | pu | Error between commanded and measured reactive power Q. |
PCC current zero enable | - | PCC current is low enough to open PCC. |
PCC current data | pu | PCC current statuses/data. |
PCC voltage zero enable | - | Voltage difference across PCC low enough to close. |
PCC voltage data | pu | PCC voltage statuses/data. |
Islanded | - |
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Microgrid is islanded. | ||
DG w ref | rad | w reference for Diesel generator to compensate microgrid angle error. |